Ligustrum [Mudaceae] [Lizustrum] Alias: eucalyptus, big-leaf privet, high pole privet Distribution of origins: Yancheng, Zhejiang and Jiangsu Provinces. Currently, Dafeng Nanyang's tall pole tree shape is optimal and both sides of the road are used for greening. The pole height is 1.8 meters above the Yangtze River basin and various provinces and regions south of the Yangtze River. Southern Gansu and southern parts of northern China are cultivated. Morphological characteristics: Evergreen trees, crown oval. Bark grayish green, smooth without cracking. Branches develop, smooth and hairless. Leaves opposite, ovate or ovate-lanceolate, apex acuminate, base cuneate or suborbicular, entire, surface dark green, shiny, glabrous, abaxially pale green, leathery. It blooms from June to July, and it is white and the panicle is top. The berry-shaped stone fruit is nearly kidney-shaped, ripening from October to November, and dark blue when cooked. Growth habit: adaptable, hi light, slightly shade-tolerant. Hi warm and humid climate, slightly hardy. Intolerant to drought and infertility, suitable for deep, moist, slightly acidic to slightly alkaline soil. The root system is developed. Sprouting, sprouting power are strong, resistant to pruning. Resist chlorine, sulfur dioxide and hydrogen fluoride. Garden use: Ligustrum virginiana is lush, green throughout the year, full of white flowers in summer, and adapted to the urban climate. It is a common tree species in the Yangtze River Valley; it is often planted in gardens and widely planted in neighborhoods, houses, or gardens. Or trimmed for hedges. Strong resistance to a variety of toxic gases, can be used as anti-pollution tree species in industrial and mining areas. Breeding and breeding: sowing, cutting propagation. After ripening in September, it was picked and dried to remove peel skin. The end of the spring from the end of March to the beginning of April, soaking with hot water, after the wet release, after 4 to 5 days after sowing. Spring and autumn cuttings are all available, but the survival rate is higher for spring insertion.
Dye intermediates, also referred to as intermediates, refer to various aromatic derivatives used in the production of dyes and organic pigments. They are derived from benzene, toluene, naphthalene, anthracene and other aromatic hydrocarbons from coal chemical and petrochemical industries through a series of organic synthesis unit processes. With the development of chemical industry, the application range of dye intermediates has been extended to pharmaceutical industry, pesticide industry, propellant and explosive industry, information recording materials industry, as well as auxiliaries, surfactants, spices, plastics, synthetic fibers and other production sectors. There are many kinds of dye intermediates, and hundreds of them are more important. The most important early dye intermediates, such as nitrobenzene, aniline, phenol, chlorobenzene and phthalic anhydride, have been developed into important basic Organic Intermediates because of their wide use and large dosage. The annual output in the world is more than one million tons. The most important dye intermediates are o-nitrochlorobenzene, p-nitrochlorobenzene, o-nitrotoluene, p-nitrotoluene, 2-naphthol, anthraquinone, 1-aminoanthraquinone and so on. Starting from the above intermediates and through a series of organic synthesis unit processes, various intermediates with complex structures can be prepared.
Dye intermediates mainly include benzene intermediates, toluene intermediates, naphthalene intermediates and anthraquinone intermediates, in addition, there are some heterocyclic intermediates. The main reaction processes of intermediate in production are nitration, sulfonation, halogenation, reduction, amination, hydrolysis, oxidation, condensation and so on. The synthesis of a complex intermediate often takes many unit processes, sometimes using different basic materials and different synthetic routes.
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